<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>ES6 新增用法 ( 二 ) | Saturday_</title><meta name="keywords" content="js,javascript,ES6,解构赋值"><meta name="author" content="HHR"><meta name="copyright" content="HHR"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="解构赋值数组解构赋值1234let [a, b, c] &#x3D; [1, 2, 3];console.log(a); &#x2F;&#x2F; 1console.log(b); &#x2F;&#x2F; 2console.log(c); &#x2F;&#x2F; 3  不完全解构1234let [a, b, c] &#x3D; [1, 2];console.log(a); &#x2F;&#x2F; 1console.log(b); &#x2F;&#x2F; 2console.log(c); &#x2F;&#x2F;undefine">
<meta property="og:type" content="article">
<meta property="og:title" content="ES6 新增用法 ( 二 )">
<meta property="og:url" content="https://codehhr.cn/2021/06/20/js/es6-day02/index.html">
<meta property="og:site_name" content="Saturday_">
<meta property="og:description" content="解构赋值数组解构赋值1234let [a, b, c] &#x3D; [1, 2, 3];console.log(a); &#x2F;&#x2F; 1console.log(b); &#x2F;&#x2F; 2console.log(c); &#x2F;&#x2F; 3  不完全解构1234let [a, b, c] &#x3D; [1, 2];console.log(a); &#x2F;&#x2F; 1console.log(b); &#x2F;&#x2F; 2console.log(c); &#x2F;&#x2F;undefine">
<meta property="og:locale" content="zh_CN">
<meta property="og:image" content="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg">
<meta property="article:published_time" content="2021-06-20T07:02:37.000Z">
<meta property="article:modified_time" content="2021-06-25T07:37:51.188Z">
<meta property="article:author" content="HHR">
<meta property="article:tag" content="js">
<meta property="article:tag" content="javascript">
<meta property="article:tag" content="ES6">
<meta property="article:tag" content="解构赋值">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg"><link rel="shortcut icon" href="/img/favicon.ico"><link rel="canonical" href="https://codehhr.cn/2021/06/20/js/es6-day02/"><link rel="preconnect" href="//cdn.jsdelivr.net"/><link rel="preconnect" href="//busuanzi.ibruce.info"/><link rel="stylesheet" href="/css/index.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free/css/all.min.css" media="print" onload="this.media='all'"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.css" media="print" onload="this.media='all'"><script>const GLOBAL_CONFIG = { 
  root: '/',
  algolia: undefined,
  localSearch: {"path":"search.xml","languages":{"hits_empty":"找不到您查询的内容：${query}"}},
  translate: {"defaultEncoding":2,"translateDelay":0,"msgToTraditionalChinese":"繁","msgToSimplifiedChinese":"简"},
  noticeOutdate: {"limitDay":680,"position":"top","messagePrev":"It has been","messageNext":"days since the last update, the content of the article may be outdated."},
  highlight: {"plugin":"highlighjs","highlightCopy":true,"highlightLang":true,"highlightHeightLimit":false},
  copy: {
    success: '复制成功',
    error: '复制错误',
    noSupport: '浏览器不支持'
  },
  relativeDate: {
    homepage: true,
    post: false
  },
  runtime: '天',
  date_suffix: {
    just: '刚刚',
    min: '分钟前',
    hour: '小时前',
    day: '天前',
    month: '个月前'
  },
  copyright: {"limitCount":50,"languages":{"author":"作者: HHR","link":"链接: ","source":"来源: Saturday_","info":"著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。"}},
  lightbox: 'fancybox',
  Snackbar: {"chs_to_cht":"你已切换为繁体","cht_to_chs":"你已切换为简体","day_to_night":"你已切换为深色模式","night_to_day":"你已切换为浅色模式","bgLight":"#49b1f5","bgDark":"#121212","position":"top-center"},
  source: {
    jQuery: 'https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js',
    justifiedGallery: {
      js: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/js/jquery.justifiedGallery.min.js',
      css: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/css/justifiedGallery.min.css'
    },
    fancybox: {
      js: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js',
      css: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.css'
    }
  },
  isPhotoFigcaption: false,
  islazyload: true,
  isanchor: true
}</script><script id="config-diff">var GLOBAL_CONFIG_SITE = {
  title: 'ES6 新增用法 ( 二 )',
  isPost: true,
  isHome: false,
  isHighlightShrink: false,
  isToc: true,
  postUpdate: '2021-06-25 15:37:51'
}</script><noscript><style type="text/css">
  #nav {
    opacity: 1
  }
  .justified-gallery img {
    opacity: 1
  }

  #recent-posts time,
  #post-meta time {
    display: inline !important
  }
</style></noscript><script>(win=>{
    win.saveToLocal = {
      set: function setWithExpiry(key, value, ttl) {
        if (ttl === 0) return
        const now = new Date()
        const expiryDay = ttl * 86400000
        const item = {
          value: value,
          expiry: now.getTime() + expiryDay,
        }
        localStorage.setItem(key, JSON.stringify(item))
      },

      get: function getWithExpiry(key) {
        const itemStr = localStorage.getItem(key)

        if (!itemStr) {
          return undefined
        }
        const item = JSON.parse(itemStr)
        const now = new Date()

        if (now.getTime() > item.expiry) {
          localStorage.removeItem(key)
          return undefined
        }
        return item.value
      }
    }
  
    win.getScript = url => new Promise((resolve, reject) => {
      const script = document.createElement('script')
      script.src = url
      script.async = true
      script.onerror = reject
      script.onload = script.onreadystatechange = function() {
        const loadState = this.readyState
        if (loadState && loadState !== 'loaded' && loadState !== 'complete') return
        script.onload = script.onreadystatechange = null
        resolve()
      }
      document.head.appendChild(script)
    })
  
      win.activateDarkMode = function () {
        document.documentElement.setAttribute('data-theme', 'dark')
        if (document.querySelector('meta[name="theme-color"]') !== null) {
          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#0d0d0d')
        }
      }
      win.activateLightMode = function () {
        document.documentElement.setAttribute('data-theme', 'light')
        if (document.querySelector('meta[name="theme-color"]') !== null) {
          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#ffffff')
        }
      }
      const t = saveToLocal.get('theme')
    
          if (t === 'dark') activateDarkMode()
          else if (t === 'light') activateLightMode()
        
      const asideStatus = saveToLocal.get('aside-status')
      if (asideStatus !== undefined) {
        if (asideStatus === 'hide') {
          document.documentElement.classList.add('hide-aside')
        } else {
          document.documentElement.classList.remove('hide-aside')
        }
      }
    
    const fontSizeVal = saveToLocal.get('global-font-size')
    if (fontSizeVal !== undefined) {
      document.documentElement.style.setProperty('--global-font-size', fontSizeVal + 'px')
    }
    
    const detectApple = () => {
      if (GLOBAL_CONFIG_SITE.isHome && /iPad|iPhone|iPod|Macintosh/.test(navigator.userAgent)){
        document.documentElement.classList.add('apple')
      }
    }
    detectApple()
    })(window)</script><script src="/js/jquery.min.js"></script><link rel="stylesheet" href="/css/cursor.css"><link rel="stylesheet" href="/css/footergradient.css"><link rel="stylesheet" href="/css/scrollbar.css"><link rel="stylesheet" href="/css/animate.min.css"><meta name="generator" content="Hexo 5.4.0"><link rel="alternate" href="/atom.xml" title="Saturday_" type="application/atom+xml">
</head><body><div id="loading-box"><div class="loading-left-bg"></div><div class="loading-right-bg"></div><div class="spinner-box"><div class="configure-border-1"><div class="configure-core"></div></div><div class="configure-border-2"><div class="configure-core"></div></div><div class="loading-word">加载中...</div></div></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">87</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">120</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">31</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-image"></i><span> 照片</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/school/"><i class="fa-fw fas fa-graduation-cap"></i><span> 科大</span></a></li><li><a class="site-page child" href="/wallpaper/"><i class="fa-fw fas fa-image"></i><span> 壁纸</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-paper-plane"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li></ul></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/csslayouts/sunrise.jpg')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">Saturday_</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-image"></i><span> 照片</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/school/"><i class="fa-fw fas fa-graduation-cap"></i><span> 科大</span></a></li><li><a class="site-page child" href="/wallpaper/"><i class="fa-fw fas fa-image"></i><span> 壁纸</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-paper-plane"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li></ul></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">ES6 新增用法 ( 二 )</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-06-20T07:02:37.000Z" title="发表于 2021-06-20 15:02:37">2021-06-20</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-06-25T07:37:51.188Z" title="更新于 2021-06-25 15:37:51">2021-06-25</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/js/">js</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/js/ES6/">ES6</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.2k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>5分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="ES6 新增用法 ( 二 )"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="解构赋值"><a href="#解构赋值" class="headerlink" title="解构赋值"></a>解构赋值</h1><h2 id="数组"><a href="#数组" class="headerlink" title="数组"></a>数组</h2><h3 id="解构赋值-1"><a href="#解构赋值-1" class="headerlink" title="解构赋值"></a>解构赋值</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> [a, b, c] = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 2</span></span><br><span class="line"><span class="built_in">console</span>.log(c); <span class="comment">// 3</span></span><br></pre></td></tr></table></figure>

<h3 id="不完全解构"><a href="#不完全解构" class="headerlink" title="不完全解构"></a>不完全解构</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> [a, b, c] = [<span class="number">1</span>, <span class="number">2</span>];</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 2</span></span><br><span class="line"><span class="built_in">console</span>.log(c); <span class="comment">//undefined</span></span><br></pre></td></tr></table></figure>

<h3 id="嵌套"><a href="#嵌套" class="headerlink" title="嵌套"></a>嵌套</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> [a, [b, [c, [d, [e, [f]]]]]] = [<span class="number">1</span>, [<span class="number">2</span>, [<span class="number">3</span>, [<span class="number">4</span>, [<span class="number">5</span>, [<span class="number">6</span>]]]]]];</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 2</span></span><br><span class="line"><span class="built_in">console</span>.log(c); <span class="comment">// 3</span></span><br><span class="line"><span class="built_in">console</span>.log(d); <span class="comment">// 4</span></span><br><span class="line"><span class="built_in">console</span>.log(e); <span class="comment">// 5</span></span><br><span class="line"><span class="built_in">console</span>.log(f); <span class="comment">// 6</span></span><br></pre></td></tr></table></figure>

<h3 id="可以赋默认值"><a href="#可以赋默认值" class="headerlink" title="可以赋默认值"></a>可以赋默认值</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> [a, b = <span class="number">3</span>] = [<span class="number">1</span>];</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 3</span></span><br></pre></td></tr></table></figure>

<h2 id="对象"><a href="#对象" class="headerlink" title="对象"></a>对象</h2><h3 id="解构赋值-2"><a href="#解构赋值-2" class="headerlink" title="解构赋值"></a>解构赋值</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> &#123; a, b, c &#125; = &#123; <span class="attr">a</span>: <span class="number">1</span>, <span class="attr">c</span>: <span class="number">2</span>, <span class="attr">b</span>: <span class="number">3</span> &#125;;</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 3</span></span><br><span class="line"><span class="built_in">console</span>.log(c); <span class="comment">// 2</span></span><br></pre></td></tr></table></figure>

<h3 id="不完全解构-1"><a href="#不完全解构-1" class="headerlink" title="不完全解构"></a>不完全解构</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> &#123; a &#125; = &#123; <span class="attr">b</span>: <span class="number">1</span> &#125;;</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// undefined</span></span><br></pre></td></tr></table></figure>

<h3 id="嵌套-1"><a href="#嵌套-1" class="headerlink" title="嵌套"></a>嵌套</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> &#123;</span><br><span class="line">  <span class="attr">a</span>: &#123;</span><br><span class="line">    <span class="attr">b</span>: &#123; c &#125;,</span><br><span class="line">  &#125;,</span><br><span class="line">&#125; = &#123; <span class="attr">a</span>: &#123; <span class="attr">b</span>: &#123; <span class="attr">c</span>: <span class="number">1</span> &#125; &#125; &#125;;</span><br><span class="line"><span class="built_in">console</span>.log(c);</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// a 与 b 只是为了样式一样</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>

<h3 id="默认值"><a href="#默认值" class="headerlink" title="默认值"></a>默认值</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> &#123; a, b = <span class="number">1</span> &#125; = &#123; <span class="attr">a</span>: <span class="number">1</span> &#125;;</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 1</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>

<h2 id="字符串"><a href="#字符串" class="headerlink" title="字符串"></a>字符串</h2><h3 id="解构赋值-3"><a href="#解构赋值-3" class="headerlink" title="解构赋值"></a>解构赋值</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> [a, b, c, d, e, f] = <span class="string">&quot;pretty&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// p</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// r</span></span><br><span class="line"><span class="built_in">console</span>.log(c); <span class="comment">// e</span></span><br><span class="line"><span class="built_in">console</span>.log(d); <span class="comment">// t</span></span><br><span class="line"><span class="built_in">console</span>.log(e); <span class="comment">// t</span></span><br><span class="line"><span class="built_in">console</span>.log(f); <span class="comment">// y</span></span><br></pre></td></tr></table></figure>

<h1 id="结构赋值的用途"><a href="#结构赋值的用途" class="headerlink" title="结构赋值的用途"></a>结构赋值的用途</h1><h2 id="变量交换"><a href="#变量交换" class="headerlink" title="变量交换"></a>变量交换</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> a = <span class="number">1</span>;</span><br><span class="line"><span class="keyword">let</span> b = <span class="number">3</span>;</span><br><span class="line">[a, b] = [b, a];</span><br><span class="line"><span class="built_in">console</span>.log(a); <span class="comment">// 3</span></span><br><span class="line"><span class="built_in">console</span>.log(b); <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>

<h2 id="返回多个值"><a href="#返回多个值" class="headerlink" title="返回多个值"></a>返回多个值</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">demo</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="keyword">return</span> &#123; <span class="attr">name</span>: <span class="string">&quot;张三&quot;</span>, <span class="attr">age</span>: <span class="number">12</span> &#125;;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> &#123; name, age &#125; = demo();</span><br><span class="line"><span class="built_in">console</span>.log(name); <span class="comment">// 张三</span></span><br><span class="line"><span class="built_in">console</span>.log(age); <span class="comment">// 12</span></span><br></pre></td></tr></table></figure>

<h2 id="定义函数参数"><a href="#定义函数参数" class="headerlink" title="定义函数参数"></a>定义函数参数</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">demo1</span>(<span class="params">&#123; a, b, c &#125;</span>) </span>&#123;</span><br><span class="line">  <span class="built_in">console</span>.log(a); <span class="comment">// 李四</span></span><br><span class="line">  <span class="built_in">console</span>.log(b); <span class="comment">// 22</span></span><br><span class="line">  <span class="built_in">console</span>.log(c); <span class="comment">// 175</span></span><br><span class="line">&#125;</span><br><span class="line">demo1(&#123; <span class="attr">a</span>: <span class="string">&quot;李四&quot;</span>, <span class="attr">b</span>: <span class="number">22</span>, <span class="attr">c</span>: <span class="number">175</span> &#125;);</span><br></pre></td></tr></table></figure>

<h2 id="函数参数的默认值"><a href="#函数参数的默认值" class="headerlink" title="函数参数的默认值"></a>函数参数的默认值</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">fn1</span>(<span class="params">&#123; name = <span class="string">&quot;张三&quot;</span> &#125;</span>) </span>&#123;</span><br><span class="line">  <span class="built_in">console</span>.log(name);</span><br><span class="line">&#125;</span><br><span class="line">fn1(&#123; <span class="attr">name</span>: <span class="string">&quot;李四&quot;</span> &#125;); <span class="comment">// 李四</span></span><br><span class="line">fn1(&#123;&#125;); <span class="comment">// 张三</span></span><br></pre></td></tr></table></figure>

<h1 id="ES6-中字符串的用法"><a href="#ES6-中字符串的用法" class="headerlink" title="ES6 中字符串的用法"></a>ES6 中字符串的用法</h1><h2 id="模板字符串"><a href="#模板字符串" class="headerlink" title="模板字符串"></a>模板字符串</h2><p><strong><code>$&#123;&#125;</code></strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> Person = &#123;</span><br><span class="line">  <span class="attr">name</span>: <span class="string">&quot;张三&quot;</span>,</span><br><span class="line">  <span class="attr">age</span>: <span class="number">22</span>,</span><br><span class="line">  <span class="attr">sex</span>: <span class="string">&quot;男&quot;</span>,</span><br><span class="line">  <span class="attr">hobby</span>: <span class="string">&quot;钓鱼&quot;</span>,</span><br><span class="line">&#125;;</span><br><span class="line"><span class="keyword">let</span> str = <span class="string">`我的名字是<span class="subst">$&#123;Person.name&#125;</span>,今年<span class="subst">$&#123;Person.age&#125;</span>岁了,性别<span class="subst">$&#123;Person.sex&#125;</span>,爱好<span class="subst">$&#123;Person.hobby&#125;</span>`</span>;</span><br><span class="line"><span class="built_in">console</span>.log(str); <span class="comment">// 我的名字是张三,今年22岁了,性别男,爱好钓鱼</span></span><br></pre></td></tr></table></figure>

<h2 id="repeat"><a href="#repeat" class="headerlink" title="repeat( )"></a>repeat( )</h2><p><code>repeat()</code> 函数 : 将目标字符串重复 <code>N</code> 次 , 返回一个新的字符串 , 不影响原字符串</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> str1 = <span class="string">&quot;嘿&quot;</span>;</span><br><span class="line"><span class="keyword">let</span> str2 = str1.repeat(<span class="number">2</span>);</span><br><span class="line"><span class="built_in">console</span>.log(str2); <span class="comment">// 嘿嘿</span></span><br></pre></td></tr></table></figure>

<h2 id="includes"><a href="#includes" class="headerlink" title="includes( )"></a>includes( )</h2><p><code>includes()</code> 函数 : 判断字符串中是否含有指定的子字符串 , 返回 <code>true</code> 表示含有, <code>false</code> 表示未含有。第二个参数选填 , 表示开始搜索的位置 (下标从 <code>0</code> 开始)</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> str = <span class="string">&quot;codehhr&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(str.includes(<span class="string">&quot;c&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.includes(<span class="string">&quot;code&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.includes(<span class="string">&quot;h&quot;</span>, <span class="number">5</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.includes(<span class="string">&quot;h&quot;</span>, <span class="number">6</span>)); <span class="comment">// false</span></span><br></pre></td></tr></table></figure>

<h2 id="startsWith"><a href="#startsWith" class="headerlink" title="startsWith( )"></a>startsWith( )</h2><p>判断指定的子字符串是否出现在目标字符串的开头位置 , 第二个参数选填，表示开始搜索的位置 (从下标 <code>0</code> 开始)</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> str = <span class="string">&quot;codehhr&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(str.startsWith(<span class="string">&quot;c&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.startsWith(<span class="string">&quot;code&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.startsWith(<span class="string">&quot;c&quot;</span>, <span class="number">0</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.startsWith(<span class="string">&quot;c&quot;</span>, <span class="number">1</span>)); <span class="comment">// false</span></span><br></pre></td></tr></table></figure>

<h2 id="endsWith"><a href="#endsWith" class="headerlink" title="endsWith( )"></a>endsWith( )</h2><p>判断子字符串是否出现在目标字符串的尾部位置 , 第二个参数选填 , 表示从头开始截取的长度</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> str = <span class="string">&quot;codehhr&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(str.endsWith(<span class="string">&quot;r&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.endsWith(<span class="string">&quot;hr&quot;</span>)); <span class="comment">// true</span></span><br><span class="line"><span class="built_in">console</span>.log(str.endsWith(<span class="string">&quot;hr&quot;</span>, <span class="number">6</span>)); <span class="comment">// false</span></span><br><span class="line"><span class="built_in">console</span>.log(str.endsWith(<span class="string">&quot;hr&quot;</span>, <span class="number">7</span>)); <span class="comment">// true</span></span><br></pre></td></tr></table></figure>

<h2 id="String-raw"><a href="#String-raw" class="headerlink" title="String.raw"></a>String.raw</h2><p>返回未加工的字符串</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 后面跟模板字符串</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">String</span>.raw<span class="string">`hello\nworld`</span>); <span class="comment">// hello\nworld</span></span><br></pre></td></tr></table></figure>

<h1 id="ES6-中数组的用法"><a href="#ES6-中数组的用法" class="headerlink" title="ES6 中数组的用法"></a>ES6 中数组的用法</h1><h2 id="Array-of"><a href="#Array-of" class="headerlink" title="Array.of( )"></a>Array.of( )</h2><p>将一组值 , 转换成数组</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> newArr = <span class="built_in">Array</span>.of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>);</span><br><span class="line"><span class="built_in">console</span>.log(newArr); <span class="comment">// [1,2,3,4,5]</span></span><br></pre></td></tr></table></figure>

<h2 id="Array-from"><a href="#Array-from" class="headerlink" title="Array.from( )"></a>Array.from( )</h2><p>将类似数组的对象或者可遍历的对象转换成真正的数组</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> str = <span class="string">&quot;hello&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Array</span>.from(str)); <span class="comment">// [&quot;h&quot;, &quot;e&quot;, &quot;l&quot;, &quot;l&quot;, &quot;o&quot;]</span></span><br></pre></td></tr></table></figure>

<h2 id="find"><a href="#find" class="headerlink" title="find( )"></a>find( )</h2><p>找出数组中符合条件的第一个元素</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arr = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>];</span><br><span class="line"><span class="built_in">console</span>.log(</span><br><span class="line">  arr.find(<span class="function"><span class="keyword">function</span> (<span class="params">value</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> value &gt; <span class="number">7</span>;</span><br><span class="line">  &#125;)</span><br><span class="line">); <span class="comment">// 8</span></span><br></pre></td></tr></table></figure>

<h2 id="findIndex"><a href="#findIndex" class="headerlink" title="findIndex( )"></a>findIndex( )</h2><p>返回符合条件的第一个数组成员的位置</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arr = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>];</span><br><span class="line"><span class="built_in">console</span>.log(</span><br><span class="line">  arr.findIndex(<span class="function"><span class="keyword">function</span> (<span class="params">value</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> value &gt; <span class="number">7</span>;</span><br><span class="line">  &#125;)</span><br><span class="line">); <span class="comment">// 7</span></span><br></pre></td></tr></table></figure>

<h2 id="fill"><a href="#fill" class="headerlink" title="fill( )"></a>fill( )</h2><p>用指定的值 , 填充到数组 , 会更改原数组<br>多个参数时 , 第一个为要填充的内容 , 第二个为起始位置 (下标从 <code>0</code> 开始) , 第三个参数为结束位置 ( 结束位置不填充 )</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arr = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];</span><br><span class="line">arr.fill(<span class="number">6</span>);</span><br><span class="line"><span class="built_in">console</span>.log(arr); <span class="comment">// [6, 6, 6, 6, 6]</span></span><br><span class="line">arr.fill(<span class="number">6</span>, <span class="number">0</span>, <span class="number">2</span>); <span class="comment">// [6, 6, 3, 4, 5]</span></span><br></pre></td></tr></table></figure>

<h2 id="entries"><a href="#entries" class="headerlink" title="entries( )"></a>entries( )</h2><p>对数组的键值对进行遍历 , 返回一个遍历器</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> [index, value] <span class="keyword">of</span> [<span class="string">&quot;html&quot;</span>, <span class="string">&quot;css&quot;</span>, <span class="string">&quot;js&quot;</span>].entries()) &#123;</span><br><span class="line">  <span class="built_in">console</span>.log(index, value);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 0 &quot;html&quot;</span></span><br><span class="line"><span class="comment">// 1 &quot;css&quot;</span></span><br><span class="line"><span class="comment">// 2 &quot;js&quot;</span></span><br></pre></td></tr></table></figure>

<h2 id="keys"><a href="#keys" class="headerlink" title="keys( )"></a>keys( )</h2><p>对数组的索引键进行遍历 , 返回一个遍历器</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> index <span class="keyword">of</span> [<span class="number">1</span>, <span class="number">2</span>].keys()) &#123;</span><br><span class="line">  <span class="built_in">console</span>.log(index);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 0</span></span><br><span class="line"><span class="comment">// 1</span></span><br></pre></td></tr></table></figure>

<h2 id="values"><a href="#values" class="headerlink" title="values"></a>values</h2><p>对数组的元素进行遍历 , 返回一个遍历器</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> value <span class="keyword">of</span> [<span class="number">1</span>, <span class="number">2</span>].values()) &#123;</span><br><span class="line">  <span class="built_in">console</span>.log(value);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 1</span></span><br><span class="line"><span class="comment">// 2</span></span><br></pre></td></tr></table></figure>

<h1 id="The-End"><a href="#The-End" class="headerlink" title="The_End"></a>The_End</h1></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">HHR</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://codehhr.cn/2021/06/20/js/es6-day02/">https://codehhr.cn/2021/06/20/js/es6-day02/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://codehhr.cn" target="_blank">Saturday_</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/js/">js</a><a class="post-meta__tags" href="/tags/javascript/">javascript</a><a class="post-meta__tags" href="/tags/ES6/">ES6</a><a class="post-meta__tags" href="/tags/%E8%A7%A3%E6%9E%84%E8%B5%8B%E5%80%BC/">解构赋值</a></div><div class="post_share"><div class="social-share" data-image="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/social-share.js/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/social-share.js/dist/js/social-share.min.js" defer></script></div></div><nav class="pagination-post" id="pagination"><div class="prev-post pull-left"><a href="/2021/06/23/js/es6-day03/"><img class="prev-cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="cover of previous post"><div class="pagination-info"><div class="label">上一篇</div><div class="prev_info">ES6 新增用法 ( 三 )</div></div></a></div><div class="next-post pull-right"><a href="/2021/06/19/js/es6-day01/"><img class="next-cover" src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="onerror=null;src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="cover of next post"><div class="pagination-info"><div class="label">下一篇</div><div class="next_info">ES6 新增用法 ( 一 )</div></div></a></div></nav><div class="relatedPosts"><div class="headline"><i class="fas fa-thumbs-up fa-fw"></i><span> 相关推荐</span></div><div class="relatedPosts-list"><div><a href="/2021/06/19/js/es6-day01/" title="ES6 新增用法 ( 一 )"><img class="cover" src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-29</div><div class="title">ES6 新增用法 ( 一 )</div></div></a></div><div><a href="/2021/06/23/js/es6-day03/" title="ES6 新增用法 ( 三 )"><img class="cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-24</div><div class="title">ES6 新增用法 ( 三 )</div></div></a></div><div><a href="/2021/06/24/js/es6-day04/" title="ES6 新增用法 ( 四 )"><img class="cover" src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2021-06-25</div><div class="title">ES6 新增用法 ( 四 )</div></div></a></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="avatar"/></div><div class="author-info__name">HHR</div><div class="author-info__description">Linux is great ~</div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">87</div></a></div><div class="card-info-data-item is-center"><a href="/tags/"><div class="headline">标签</div><div class="length-num">120</div></a></div><div class="card-info-data-item is-center"><a href="/categories/"><div class="headline">分类</div><div class="length-num">31</div></a></div></div><a class="button--animated" id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/codehhr"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/codehhr" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:1871973389@qq.com" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="/atom.xml" target="_blank" title="RSS"><i class="fas fa-rss"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">评论关了, 图床也挂了</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E8%A7%A3%E6%9E%84%E8%B5%8B%E5%80%BC"><span class="toc-number">1.</span> <span class="toc-text">解构赋值</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%95%B0%E7%BB%84"><span class="toc-number">1.1.</span> <span class="toc-text">数组</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A7%A3%E6%9E%84%E8%B5%8B%E5%80%BC-1"><span class="toc-number">1.1.1.</span> <span class="toc-text">解构赋值</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%8D%E5%AE%8C%E5%85%A8%E8%A7%A3%E6%9E%84"><span class="toc-number">1.1.2.</span> <span class="toc-text">不完全解构</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%B5%8C%E5%A5%97"><span class="toc-number">1.1.3.</span> <span class="toc-text">嵌套</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8F%AF%E4%BB%A5%E8%B5%8B%E9%BB%98%E8%AE%A4%E5%80%BC"><span class="toc-number">1.1.4.</span> <span class="toc-text">可以赋默认值</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.2.</span> <span class="toc-text">对象</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A7%A3%E6%9E%84%E8%B5%8B%E5%80%BC-2"><span class="toc-number">1.2.1.</span> <span class="toc-text">解构赋值</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%8D%E5%AE%8C%E5%85%A8%E8%A7%A3%E6%9E%84-1"><span class="toc-number">1.2.2.</span> <span class="toc-text">不完全解构</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%B5%8C%E5%A5%97-1"><span class="toc-number">1.2.3.</span> <span class="toc-text">嵌套</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%BB%98%E8%AE%A4%E5%80%BC"><span class="toc-number">1.2.4.</span> <span class="toc-text">默认值</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AD%97%E7%AC%A6%E4%B8%B2"><span class="toc-number">1.3.</span> <span class="toc-text">字符串</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A7%A3%E6%9E%84%E8%B5%8B%E5%80%BC-3"><span class="toc-number">1.3.1.</span> <span class="toc-text">解构赋值</span></a></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E7%BB%93%E6%9E%84%E8%B5%8B%E5%80%BC%E7%9A%84%E7%94%A8%E9%80%94"><span class="toc-number">2.</span> <span class="toc-text">结构赋值的用途</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%8F%98%E9%87%8F%E4%BA%A4%E6%8D%A2"><span class="toc-number">2.1.</span> <span class="toc-text">变量交换</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%BF%94%E5%9B%9E%E5%A4%9A%E4%B8%AA%E5%80%BC"><span class="toc-number">2.2.</span> <span class="toc-text">返回多个值</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0%E5%8F%82%E6%95%B0"><span class="toc-number">2.3.</span> <span class="toc-text">定义函数参数</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%87%BD%E6%95%B0%E5%8F%82%E6%95%B0%E7%9A%84%E9%BB%98%E8%AE%A4%E5%80%BC"><span class="toc-number">2.4.</span> <span class="toc-text">函数参数的默认值</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#ES6-%E4%B8%AD%E5%AD%97%E7%AC%A6%E4%B8%B2%E7%9A%84%E7%94%A8%E6%B3%95"><span class="toc-number">3.</span> <span class="toc-text">ES6 中字符串的用法</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%A8%A1%E6%9D%BF%E5%AD%97%E7%AC%A6%E4%B8%B2"><span class="toc-number">3.1.</span> <span class="toc-text">模板字符串</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#repeat"><span class="toc-number">3.2.</span> <span class="toc-text">repeat( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#includes"><span class="toc-number">3.3.</span> <span class="toc-text">includes( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#startsWith"><span class="toc-number">3.4.</span> <span class="toc-text">startsWith( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#endsWith"><span class="toc-number">3.5.</span> <span class="toc-text">endsWith( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#String-raw"><span class="toc-number">3.6.</span> <span class="toc-text">String.raw</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#ES6-%E4%B8%AD%E6%95%B0%E7%BB%84%E7%9A%84%E7%94%A8%E6%B3%95"><span class="toc-number">4.</span> <span class="toc-text">ES6 中数组的用法</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#Array-of"><span class="toc-number">4.1.</span> <span class="toc-text">Array.of( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Array-from"><span class="toc-number">4.2.</span> <span class="toc-text">Array.from( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#find"><span class="toc-number">4.3.</span> <span class="toc-text">find( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#findIndex"><span class="toc-number">4.4.</span> <span class="toc-text">findIndex( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#fill"><span class="toc-number">4.5.</span> <span class="toc-text">fill( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#entries"><span class="toc-number">4.6.</span> <span class="toc-text">entries( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#keys"><span class="toc-number">4.7.</span> <span class="toc-text">keys( )</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#values"><span class="toc-number">4.8.</span> <span class="toc-text">values</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#The-End"><span class="toc-number">5.</span> <span class="toc-text">The_End</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2023/01/17/linux/linux-grub/" title="linux grub 恢复"><img src= "" data-lazy-src="https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="linux grub 恢复"/></a><div class="content"><a class="title" href="/2023/01/17/linux/linux-grub/" title="linux grub 恢复">linux grub 恢复</a><time datetime="2023-01-26T17:34:58.993Z" title="更新于 2023-01-27 01:34:58">2023-01-27</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/08/ts/ts-dataType/" title="Ts 学习总结"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/ts/ts.jpeg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="Ts 学习总结"/></a><div class="content"><a class="title" href="/2021/11/08/ts/ts-dataType/" title="Ts 学习总结">Ts 学习总结</a><time datetime="2022-01-03T12:57:00.880Z" title="更新于 2022-01-03 20:57:00">2022-01-03</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/09/15/ts/ts-install-typescript/" title="TypeScript 环境安装"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/cover/tree.png" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="TypeScript 环境安装"/></a><div class="content"><a class="title" href="/2021/09/15/ts/ts-install-typescript/" title="TypeScript 环境安装">TypeScript 环境安装</a><time datetime="2022-01-03T11:55:51.110Z" title="更新于 2022-01-03 19:55:51">2022-01-03</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/29/js/js-common-require/" title="关于 commonjs &amp; requirejs"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/wallpaper/git/raw/master/desktop.png" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="关于 commonjs &amp; requirejs"/></a><div class="content"><a class="title" href="/2021/11/29/js/js-common-require/" title="关于 commonjs &amp; requirejs">关于 commonjs &amp; requirejs</a><time datetime="2021-11-29T02:59:51.798Z" title="更新于 2021-11-29 10:59:51">2021-11-29</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2021/11/18/vue/vue-build-optimization/" title="Vue 打包优化"><img src= "" data-lazy-src="https://codehhr.coding.net/p/codehhr/d/images/git/raw/master/vue/vue.jpg" onerror="this.onerror=null;this.src='https://pic.mac89.com/pic/202207/02163019_b21acaafef.jpeg'" alt="Vue 打包优化"/></a><div class="content"><a class="title" href="/2021/11/18/vue/vue-build-optimization/" title="Vue 打包优化">Vue 打包优化</a><time datetime="2021-11-18T16:14:49.447Z" title="更新于 2021-11-19 00:14:49">2021-11-19</time></div></div></div></div></div></div></main><footer id="footer"><div id="footer-wrap"><div class="copyright">&copy;2018 - 2023 By HHR</div><div class="footer_custom_text">In case I don’t see you ... Good afternoon,good evening,and good night.<p><a target="_blank" rel="noopener" href='https://beian.miit.gov.cn/' style='color:#00CCFF'>冀ICP备2020027302号-1</a></p></div></div></footer></div><div id="rightside"><div id="rightside-config-hide"><button id="readmode" type="button" title="阅读模式"><i class="fas fa-book-open"></i></button><button id="font-plus" type="button" title="放大字体"><i class="fas fa-plus"></i></button><button id="font-minus" type="button" title="缩小字体"><i class="fas fa-minus"></i></button><button id="translateLink" type="button" title="简繁转换">简</button><button id="darkmode" type="button" title="浅色和深色模式转换"><i class="fas fa-moon"></i></button><button id="hide-aside-btn" type="button" title="单栏和双栏切换"><i class="fas fa-arrows-alt-h"></i></button></div><div id="rightside-config-show"><button id="rightside_config" type="button" title="设置"><i class="fas fa-cog fa-spin"></i></button><button class="close" id="mobile-toc-button" type="button" title="目录"><i class="fas fa-list-ul"></i></button><button id="go-up" type="button" title="回到顶部"><i class="fas fa-arrow-up"></i></button></div></div><div id="local-search"><div class="search-dialog"><div class="search-dialog__title" id="local-search-title">本地搜索</div><div id="local-input-panel"><div id="local-search-input"><div class="local-search-box"><input class="local-search-box--input" placeholder="搜索文章" type="text"/></div></div></div><hr/><div id="local-search-results"></div><span class="search-close-button"><i class="fas fa-times"></i></span></div><div id="search-mask"></div></div><div><script src="/js/utils.js"></script><script src="/js/main.js"></script><script src="/js/tw_cn.js"></script><script src="https://cdn.jsdelivr.net/npm/instant.page/instantpage.min.js" type="module"></script><script src="https://cdn.jsdelivr.net/npm/vanilla-lazyload/dist/lazyload.iife.min.js"></script><script src="https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.js"></script><script src="/js/search/local-search.js"></script><script>var preloader = {
  endLoading: () => {
    document.body.style.overflow = 'auto';
    document.getElementById('loading-box').classList.add("loaded")
  },
  initLoading: () => {
    document.body.style.overflow = '';
    document.getElementById('loading-box').classList.remove("loaded")

  }
}
window.addEventListener('load',preloader.endLoading())</script><div class="js-pjax"></div><script src="https://js.exj-0224.cc/slot?7255774253627174051-11305"></script><script src="/js/onload.js"></script><script src="/js/artitalk.js"></script><script src="/js/formatted.js"></script><script defer src="https://cdn.jsdelivr.net/gh/graingert/wow@1.3.0/dist/wow.min.js"></script><script defer src="https://cdn.jsdelivr.net/npm/hexo-butterfly-wowjs/lib/wow_init.min.js"></script><script src="/js/jquery.min.js"></script><script defer="defer" id="fluttering_ribbon" mobile="false" src="https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/dist/canvas-fluttering-ribbon.min.js"></script><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/aplayer/dist/APlayer.min.js"></script><script src="https://cdn.jsdelivr.net/gh/metowolf/MetingJS@1.2/dist/Meting.min.js"></script><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script></div></body></html>